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Makes building complex GUI's easy

This is a framework which tries to make building complex GUI's easy, by
offering these two main features:

* Consistent looking GUI without the need to code resp. tune each widget
by hand. Instead you declare the structure of your GUI, connect it to
the data of your program (which should be a well defined set of objects)
and control how this structure is transformed into a specific layout in
a very generic way.

* Automatically keep widget and object states in sync (in both
directions), even with complex data structures with a lot of internal
dependencies, object nesting etc.